Carburetor



Feb. 16 1926. 1,572,967

\ w. SCHMLD CARBURETOR Filed May 28, 1920 4`SheeS-Sheel, 4

Suva/wko: WILLIAM SCI'WHDy q/vHWwoo-M GMM vfollowing specification.

latented Feb.. 16, i926.

UNITED STATES WILLIAM SCHMID, OF BRONSON, MICHIGAN.

CARBURETOR.

Application filed May 28, 1920. Serial No. 384,824.'

To all 'whom t mag/ concern.'

Be it known 'that I, WILLIAM SCHMID, a citizen of the United States, residing at Bronson,'county of Branch, State of Michigan, have invented certain new and useful Improvements in Carburetors, of which the following is a specification.

This invention relates toimprovements in carburetors.

The main objects of this invention are:

First, to provide an improved carburetor in which the fuel, suoli as liquid hydrocarbon, andthe air are efliciently mixed and apportioned throughout the variations in running speeds of the engine. l

Second, to provide an improved carburetor in whichv the apportioiiing of the fuel delivered .may be manually varied as desired.

Third, to provide in a carburetor an improved priming means.

Fourth, to provide an improved carburetor having these advantages which is lcompact and comparatively simple in struct-ure.

Further objects, and objects relating to structural details will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing forming a part of this specification, in which:

Fig. I is a side elevation of 'a structuie i embodying the features of my invention, the

air inlet pipes being broken away. Fig. II is a vertical section on a line corresponding to line 2-,2 of Figs. IIA and IV with the carbureting nozzle in priming position.

Fig. IIA is a detail vertical section on a line corresponding to line 2A2^ of Figs. 'II and IV, parts being shown in elevation for convenience in illustration.

Fig. III is a detail vertical section corresponding to that of Fig. II Vwith the suction actuated member raised.

Fig. IV is a horizontal section on a line corresponding to line 4-4 of Fig. II.

Fig. V is a detail vertical central sec tion of another embodiment of my invention. Y v

described in the f taken looking in the direction of the little arrows at the ends of the section lines. f

Referring to the drawing, the embodiment of my invention illustrated comprises' a tubular body member 1 having a primary air inlet chamber 2 therein.v At the upper end the member 1 is provided with a cylinder 3 for the suction actuated member 4 j and with an outwardly projectingflange 5. The top member 6 has a secondary air inlet chamber 7 therein and a cylinder mixing chamber member 8 aligned with the cyliiider 3, the edges of thecylinder 3 and the memberS being spaced to provide a secondary air inlet opening 9 for the mixing chamber 10.

The top member 6 is provided with a flange 11 for the attachment of the carbuietor. The discharge 13 for the mixing chamber r10 is controlled by the throttle valve 14. l

A connection 15 is provided at the lower end of the primary air chamber 2 so that if desired a hot air supply means may be connected to deliver thereto. A hotA air vconnection 16 is also yprovided for the secwith the weighted valve 18 so that when the suction exceeds a predetermined amount this valve is opened to admit cold air.

The fuel reservoir 19 is mounted on the' body member 1, with its upper edge against the flange centrallyA within the body member l which is provided with an inwardly projecting arm 21 having a passage 22 therein communicating with the nozzle.

The fuel supply connection 23 is controlled by the valve 24 and its float 25.` The fuel nozzle delivers to the carbureting nozzle 26 which is mounted on the fuel nozzle for vertical adjustmentthereon and so as to deliver centrally into the mixing chamber. This carburetinfr nozzle is provided with air inlet ports 2 opening into the primary air inlet chamber and is upwardly tapered to coact with the annular valve 28 on the suction actuated member 4, so that as this valve is raised, the opening is increased. The opening is also increased as the carbureting nozzle is lowered.

5. The fuel nozzle 2O is mounted the lever 29 pivoted at 30 to engage the cross pin 31 of the downwardly projecting arms 32 on the earbureting nozzlew-see Fig. IIA.

A coiled spring 33 arranged in the seat 84 on the arm 2l urges the nozzle downward or the pin 3l against the control lever. The stop is provided for the lever, the operating connections for the lever not being illustrated as suitable means will be readily supplied.

The suction actuated member i carries the cylindrical or sleeve valve S6 slidable within the mixing` chamber member 8 so that as the suction actuated member is raised, Jehe secondary air is admitted to the mixing chamber. The suction actuated member, coacting with the cylinder 3 forms a dash pot preventing chattering of the suction actuated member, a check valve being provided for the dash pot, perniitting the suction actuated member to return quite promptly to its initial position but retarding its opening movement.

The tubular part 4 of the suction actuated member i in the embodiment shown in Figs. I to IV inclusive embraces a cylindrical part of the nozzle member providing a primary air passage of relatively fixed cross section.

Considering the operation of the carburetor reference will first be had to Fig. II showing the carburetor adjusted for priming purposes so that an internal combustion engine will receive a rich explosive charge, mostly fuel with just sufficient air for atomizing purposes. In this view of the drawing the carbureting nozzle 2G has been raiser so that its upper tapered end will cooperate lwith the opening in the valve 28 in providinO' aracticalli the minimum restriction for e f L primary air entering the mixing chamber through the valve. The entrance of primary air to the lower end of the valve is constant in its preferred form of construction, but by restricting the outlet of the air from the valve into the mixing chamber increases the depression in the mixing chainbei"7 so that a greater quantity of fuel is lifted from the nozzle for priming or starting purposes, there being just enough air entering the ports 27 for atomizing purposes.

The automobile engine having been primed and started the carbureting nozzle 26 is lowered to its normal position shown in Fig. IIA and by comparing the position of the nozzle in this figure with the priming position shown in Fig. II, it will be noted that the opening of the valve 28 has been enlarged so that the primary air will have greater leeway into the mixing chamber than through the inlet ports 27 of the carbureting nozzle. In consequence of this arrangement of parts there will be a desired admixture of air and fuel for engine operating purposes; idling` of the engine being controlled by the throttle 14;.-

lVhen the valve 28 is raised, as shown in F ig. III there is a secondary supply of air and greater leeway for primary air from the bottom of the valve to enter the mixing chamber. In all instances of nozzle or valve adjustment the supply of primary air at the lower end of the valve remains constant because of the relation of the annular wall of the valve 28 to the annular wall of the nozzle 26, and in adjusting the nozzle for priming purposes it is only a question of reducing the supply of primary air to the mixing chamber by restricting the opening at the valve 28 to produce a rich mixture.

In order that the supply of primary air to the mixing chamber may be varied at the lower end of the valve, the carbureting nozzle has been shown in a modified form illustrated in Figure V with another tapered portion 37 which is adjustable relative to the lower end of the valve and by adjusting the nozzle the passage between the valve and the nozzle may be increased or decreased in area and thus provide means of regulating the proportion of primary air to the fuel. Y

IV ith the parts thus arranged, I secure a very effective apportioning and mixing of the air and fuel, it being possible to increase the apportioning of fuel by the adjustment of the carbureting nozzle member 26. The air passing through the ports 27, which are always open, mixes with the fuel in the carbureting nozzle and the carbureted air is delivered centrally into the mixing chamber and centrally of the'column of air passing the valve 28. The secondary supply of air is delivered through an annular' opening so that it is evenly mixed with the carbureted air.

I have illustrated and described my improvements in an embodiment which I consider practical both from the manufacturing and utility standpoints. I have not attempted to illustrate or describe certain modifications and adaptations which I contemplate within the scope of the appended claims as I believe the disclosure made will enable those skilled in the art to which my invention relates to embody or adapt the same as may be desired. Y

Having thus described my invention,what I claim as new and desire to secure by Letters Patent is:

l. In a carburetor, the combination of a tubular bottom body member having apri-A mary air inlet chamber at its lower end and a cylindrical mixing chamber above said primary air chamber and adapted to receive a secondary supply of air, a fuel nozzle disposed centrally within said primary air inlet chamber, a carbureting nozzle to vwhich said fuel nozzle delivers having an upwardly tapered tip delivering centrally within the mixing chamber, said carbureting nozzle being adjustable relative to said fuel nozzle and provided with a plurality of air inlet ports at the base of its tapered portion adjacent the tip of the fuel nozzle, an annular primary air inlet valve slidable Within said tubular body member and coacting With the tapered part of said carbureting nozzle, a suction actuated member by which said primary air valve is carried mounted within said cylindrical mixing chamber member which constitutes a cylinder therefor, and means operatable in the primary air inletchamber of said tubular body member adapted for adjusting said carbureting nozzle.

2. In a carburetor, the combination of a body member having a primary air inlet chamber at its lower Vend and a mixing chamber member above said primary airchamber, al fuel nozzle disposed centrally within said primary air inlet chamber, a earbureting nozzle to'which said fuel nozzle delivers having an upwardly tapered tip delivering'centrally within' the mixing chamber, said carbureting nozzle having air inletl ports at the base of its tapered portion and adjacent -the tip of the fuel nozzle, an annular primary air inlet valve through which the tapered part of said carbureting nozzle extends and eoacts therewith, a suction actuated member by which said primary air valve is carried, said carbureting nozzle slidably fitting on said fuel nozzle and adjustable relative to said primary air inlet valve and said fuel nozzle, and means axially of said carbureting nozzle retaining said carbureting nozzle normally lowered relative to said fuel nozzle.

3. In a carburetor, the combination of a tubular body member having a mixing chamber, a fuel nozzle, a tapered carbureting nozzle delivering to said mixing chamber and constituting a housing for the tip of said fuel nozzle, said carbureting nozzle being slidable on said fuel nozzle and provided with air inlet ports adjacent the tip of the fuel nozzle, an annular primary air inlet valve slidable in said tubular body and ceac-ting with said tapered carbureting nozzle to regulate the passage of air around the same and thereby control the passage of air throughsaid air inlet ports of said carbureting nozzle, and means operatable axially of said nozzles adapted for sliding said oarbureting nozzle relative to said primary air inlet valve. l l

4. In a carburetor, the combination of a mixing chamber, a stationary fuel nozzle, a tapered carbureting nozzle slidable onsaid fuel nozzle and delivering to said mixing chamber and constituting a housing for the tip of said fuel nozzle, said carbureting nozzle being provided with air inlet ports adjacent the tip of the fuel nozzle, an annular primary air inlet valve coacting with said tapered carbureting nozzle to regulate the passage of air around the same and thereby control the passage of air through saidair inlet ports of said carbureting nozzle, a suction actuated member automatically controlling said primary air valve, means in the lower part of said fuel nozzle for sliding said earbureting nozzle lin one direction and means for manually adjusting said carbureting nozzle in an opposite direction for varying its relation to said primary air valve.

In Witness whereof, I have 'hereunto set my hand and seal.

WILLIAM soHMiD. [La] 

